# The direction of time and Boltzmann's time hypothesis

## TL;DR

This paper examines Boltzmann's time hypothesis linking perceived time direction to the second law of thermodynamics, discusses mechanisms behind it, and explores experimental tests including CP-violation in particle physics.

## Contribution

It introduces a time-symmetric version of Everett's many-worlds interpretation based on thermodynamic quantum collapse, and discusses potential experimental tests for mechanisms of time direction.

## Key findings

- CP-violations may test time direction mechanisms
- Time-symmetric Everett interpretation proposed
- Thermodynamic basis for perceived causality

## Abstract

This work explores Boltzmann's time hypothesis, which associates the perceived direction of "time flow" with the second law of thermodynamics. We discuss mechanisms that can be responsible for the action of the second law, for directional properties of time and, ultimately, for the perception that past events cause future events. Special attention is paid to possibility of testing these mechanisms in experiments. It is argued that CP-violations known in particle physics may offer such an opportunity. A time-symmetric version of Everett's many-worlds interpretation (which is based on a thermodynamic interpretation of quantum collapses) is given in the Appendix.